Signal coupling circuit and associated method
AssigneeMStar Semiconductor, Inc.
InventorsChao-Chun Sung, Chao-Ping Huang, Chien-Hung Chen, Chu-Wei Hsia
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Abstract
A signal coupling circuit for generating an output signal according to an input signal is provided. The signal coupling circuit includes: a coupling capacitor, configured to generate a coupling signal according to the input signal; a clock generating circuit, configured to generate a clock and determine a duty cycle of the clock by the coupling capacitor; a discharge circuit, configured to intermittently discharge the coupling capacitor according to the duty cycle of the clock; and an output circuit, coupled to the coupling capacitor, for generating the output signal according to the coupling signal.
Claims20
A signal coupling circuit, configured to generate an output signal according to an input signal, comprising:
- a coupling capacitor, configured to generate a coupling signal according to the input signal;
- a clock generating circuit, configured to generate a clock, and to determine a duty cycle of the clock by the coupling capacitor;
- a discharge circuit, coupled to the coupling capacitor and the clock generating circuit, for intermittently discharging the coupling capacitor according to the duty cycle of the clock, the discharge circuit comprising:
- a switch, coupled to the coupling capacitor, switching between an on state and an off state according to the duty cycle of the clock;
- and
- a discharge unit, coupled to the switch, discharging the coupling capacitor when the switch switches to the on state and stopping discharging the coupling capacitor when the switch switches to the off state;
- and
- an output circuit, coupled to the coupling capacitor, for generating the output signal according to the coupling signal.
A signal coupling method, for generating an output signal according to an input signal, performed by a signal coupling circuit, comprising:
- generating a coupling signal by a coupling capacitor according to the input signal;
- providing a clock, and determining a duty cycle of the clock by the coupling capacitor;
- intermittently discharging the coupling capacitor according to the duty cycle of the clock, comprising:
- switching a switch between an on state and an off state according to the duty cycle of the clock;
- and
- discharging the coupling capacitor via the switch when the switch switches to the on state;
- and
- generating the output signal according to the coupling signal.
Dependencies are inferred from the claim text.